sugar candy vs candy

sugar candy and candy both are nouns.

Word	Noun	Adjective	Verb	Adverb
sugar candy	Yes	No	No	No
candy	Yes	No	Yes	No

As nouns, candy is a hypernym of sugar candy; that is, candy is a word with a broader meaning than sugar candy:

sugar candy: made by boiling pure sugar until it hardens
candy: a rich sweet made of flavored sugar and often combined with fruit or nuts

Other hypernyms of sugar candy include confect.

sugar candy (noun)	candy (noun)
made by boiling pure sugar until it hardens	a rich sweet made of flavored sugar and often combined with fruit or nuts

sugar candy (verb)	candy (verb)
	coat with something sweet, such as a hard sugar glaze